The matchbox game

In turn, each person must take a matchbox and hold it between two fingers, their thumb touching the table between themselves and their pint of beer. They must then throw the matchbox over their pint without taking their thumb off the table. Where and how the matchbox lands decides what happens next.

If the box lands on its long narrow side (the striking side) then two fingers of beer are added to the current forfeit. If the box lands on its short side, four fingers of beer are added to the current forfeit.
If the box lands flat on its side. The player must drink whatever forfeit has accumulated in one. The turn then passes to the next player.

This is the basis of the game, other rules have been added to spice it up a little.